/Engine/Plugins/Animation/IKRig/Source/IKRigEditor/Public/RigEditor/IKRigController.h
Get the name of the Root Bone of the retargeting (can only be one).
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=IKRig) [FName](API\Runtime\Core\UObject\FName) GetRetargetRoot() const